Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64daa2132476c04…

MALICIOUS

PDF

80.9 KB Created: 2021-01-11 12:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0a15e33df7b57ad96ae78b280d8ad73f SHA-1: dedd3bf2dbbe5d045979af10d168ae95326fe71b SHA-256: a64daa2132476c04f3c6787346404b01728ad1e1e6f4ab50560dce14abbab523
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffmen.ru/aws?utm_term=instrumentation+in+research+methodology+pdf In PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/download_mcpe_master_apk_uptodown.pdfIn PDF document text
    • https://site-1083679.mozfiles.com/files/1083679/zerolu.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/jiiczsX/i_wish_her_happiness.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/hgjrhaS/usf_business_administration_degree_requirements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5ffc21db1ec09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_5fdcec97af283.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/multi_games_new_arcade_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_5fb40bcf54401.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/nova_launcher_pro_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489717/normal_5fc3f13cb4654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fb2d342d39df.pdfIn PDF document text
    • https://site-1185125.mozfiles.com/files/1185125/buzudenotedekagu.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/stack_ball_vs_helix_jump.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 5488 bytes
SHA-256: 8c60d5b067a561324c4b69a65e13b94f67c410445a34e8e2519e0c613531402e
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 10968 bytes
SHA-256: 3205d141f755e946dca9a92bc865ec290251fab060b1b0f05be1d8212aae3e1c
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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